Chelsea Clinton, only child of Bill and Hillary, has welcomed a son.
Chelsea, 36, announced on Twitter that she and husband Marc Mezvinsky have named their baby Aidan Clinton Mezvinsky.
Aidan is the younger brother to the couple's daughter Charlotte, who will turn two in September.
Chelsea, who announced her second pregnancy in late December, has been campaigning on behalf of her mother, the presumptive Democratic presidential nominee.
Aidan isn't the first baby to be born as the grandchild of a presidential candidate this year -- in March, presumptive Republican nominee Donald Trump's daughter Ivanka welcomed her third child, son Theodore James.
Bill and Hillary have sent well wishes after the birth of Aidan, stating: "We are overjoyed to be grandparents again ... Chelsea and Aidan are both doing well and enjoying this very special time together."
Newshub.